Replacing old inventory protecting with safe packet modifications using ProtocolLib.

Instead of clearing the inventory of players and storing it's contents in a file, we now prevent
the server from sending the inventory packet if the player is not logged in. The player will
see a empty inventory, but has still his items stored on the server. Therefore we don't
need to modify the player's inventory and we won't make any inventory corrupted.

Fixes Xephi/AuthMeReloaded#203,
Fixes Xephi/AuthMeReloaded#193,
Fixes Xephi/AuthMeReloaded#191,
Fixes Xephi/AuthMeReloaded#148

Remove dead code + Fix empty inventory on the unregister command

Fix NPE if ProtocolLib isn't enabled or installed

src/main/java/fr/xephi/authme/events/ProtectInventoryEvent.java

@@ -4,7 +4,7 @@ import org.bukkit.entity.Player;
 import org.bukkit.inventory.ItemStack;
 
 /**
- * 
+ *
  * This event is call just after store inventory into cache and will empty the
  * player inventory.
  *
@@ -18,12 +18,11 @@ public class ProtectInventoryEvent extends CustomEvent {
     private ItemStack[] emptyArmor = null;
     private Player player;
 
-    public ProtectInventoryEvent(Player player, ItemStack[] storedinventory,
-            ItemStack[] storedarmor) {
+    public ProtectInventoryEvent(Player player) {
         super(true);
         this.player = player;
-        this.storedinventory = storedinventory;
-        this.storedarmor = storedarmor;
+        this.storedinventory = player.getInventory().getContents();
+        this.storedarmor = player.getInventory().getArmorContents();
         this.emptyInventory = new ItemStack[36];
         this.emptyArmor = new ItemStack[4];
     }